What military rank is a dot?

Excuse me, could you please clarify something for me? I've come across the term 'dot' being used in a military context, and I'm rather perplexed as to what rank it might represent. Could you enlighten me on this matter? I'm particularly interested in understanding its significance and where it fits within the hierarchy of military ranks. Is it a specific designation used in a certain branch of the military, or is it a more general term with varying meanings? I'm really quite curious about this and would appreciate any insight you can provide.